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Newton's Laws Quiz

2002

Fnet = m * a
Fgrav = m * g
g = ~10 m/s2
a = change velocity/time

1. The diagrams below depict the individual forces acting upon an object. Each arrow represents a force and the length of the arrow represents the size of the force. Based on this information, which objects could be moving to the right at a constant speed? List all that apply in alphabetical order with no spaces between letters.

2. The velocities and masses of four objects are given below. Which one of the following objects has the greatest inertia?

a. 5 kg object moving at 12 m/s

b. 12 kg object moving at 5 m/s

c. 21 kg object moving at 3 m/s

d. 55 kg object which is not moving (v = 0 m/s)

3. The forces acting on an object are balanced. It is known for sure that the object must

a. be at rest.

b. be moving with a constant velocity.

c. not be accelerating.

d. none of these

4. The oil drop diagram below depicts the motion of a rightward-moving object. Which of the force diagrams is consistent with the oil drop diagram? (The arrows on the force diagrams represent forces; the length represent the size of the force.) Circle all that apply in alphabetical order with no spaces between letters.

5. Little Billie has a mass of 25 kg. The acceleration of gravity on the moon is one-sixth of the value on Earth. What is Little Billie's weight on the moon? _____________ What is Little Billie's mass on the moon? _____________

6. Mr. Smith guides a golf ball around the outside rim of the green at the Hole-In-One Putt-Putt Golf Course. When the ball leaves the rim, which path (A, B or C) will the golf ball follow? _________ Explain why.

7. Big Bubba weighs 1000-N. The amount of force which must be applied to Big Bubba in order to lift him upward with a constant velocity of 2 m/s is

a. more than 1000-N.

b. less than 1000-N.

c. equal to 1000-N.

d. impossible to tell without further information

8. A force of F on a mass M causes an acceleration of 24 m/s2. What acceleration will result from a different force of 4 F on the same mass of M?

9. A force of F on a mass M causes an acceleration of 24 m/s2. What acceleration will result from the same force of F on a different mass of 1/3 M?

10. Construct free-body diagrams (force diagrams) for the following three physical situations. Draw arrows to show the direction of any forces acting upon the object. Label each arrow according to the type of force; choices include Fgrav, Fair, Fnorm, Ffrict, Fspring, and Fapplied.

 

a. A book is at rest upon a table.

 

 

 

 

b. A baseball is moving upwards towards the peak of its trajectory and slowing down. Neglect Fair.

 

 

 

c. A rightward-moving, "un-manned" sled is coasting to a stop across the rough snow.

 

 

 

 

11. Consider the following statements and corresponding free-body diagrams (force diagrams). Read the statement and fill in all the blanks in the diagram.

a. A 45-N rightward force is applied to a 20-kg box to accelerate it towards the right across the floor. The box encounters 15-N of frictional force. Fill in the blanks.

Fnet = ___________

a = _____________

b. An 800-kg unoccupied freight elevator, supported by a large cable, is descending with a constant velocity of 2.0 m/s, down. Fill in the blanks

Fnet = ___________

a = _____________

12. Ben Tooclose is being chased through the woods by a bull moose which he was attempting to photograph. In the course of the chase, who (Ben, the moose, or neither) would have the mass advantage? ____________________ Explain your answer (i.e., explain how).

 

 

 

13. A 20-kg object will encounter a 50-N frictional force when pushed across a horizontal surface. With what horizontal force must you push the object in order to maintain a constant velocity? ________ Explain your answer or show your calculation.

 

 

 

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